At last you have hit on a Genus that I just don't like, Todd, (nor do several others)
Maybe it is just snobbery about Achillea millefolium but when I suggested here that we start a plant collection for 'Plant Heritage' and told people that Achillea was the first on the list, the answer was 'no, no, no'.
I think that was a 'no'.

Lortay;
I have a lot of different varieties. One is very vigorous, tall thing. I planted it in too good of soil in my garden. It took grew so much that it became a tangled mess. I pulled them up, killed a lot and used it on a bank that was recently excuvated to make a road, and it was eroding.

It stopped the erosion and becasue the soil was so poor, it made that plant become better behaved. Now it grows straight and pretty tall.

There are also other cultivars. Some have very fine lacey foliage that look like ferns,they are very well behaved, with pretty blooms. Some, can even be easily dried for flower arrangements. You should try some of these before you vote no.

Are those people crazy or what???
The only requirements for beautiful Moonshine in my garden seem to be poor soil, extended drought/very little water, and occasional deadheading/harvesting of the blooms/spent flowers.
I almost lost my plants one year to an over application of compost, lots of rain, and neglecting to pick it.
Won't make those mistakes again!
We've had over 100 degree days for weeks in OKC and I've watered once a week or less with great results.

It has been really really hot this year that is for sure - here too.
we have had rain, but even with no rain - one thing I do not have to worry about is the moonshine.
I have this in front of my house, beside my sidewalk. Once they stop blooming I cut them down, they have blue gray foliage, it matches the roof of my house. Looks pretty cool.

I have Irish ancesteries. Great Grandma was a Daughtery, I knew her well, she lived to be 105 years old. Her greatgrandparents came over in during the potato famine. I have blond hair, blue eyes, inspite of a lot of Cherokee blood on all the other sides.

So I can tell you - without a doubt never has there been a more stubborn people on the face of the earth, than the Irish.

I know because I have been told over and over again I got my stubborness from my great grandma. I am proud of that because she was also very likable.
.

AAAAHHHAAAA!
Todd,
That is the problem. You do have to grow them to learn to love them, or at least to start to love them.
To grow them is to learn to love the smell too.
And even drying the flowers - the moon beam does great!
Even as an herb it's history is extrodinary!
What was the great battle when all the soldiers of Rome were laying wounded and dying. It was the yarrow growing in abundance near by that saved so many lives.

Butterflies love the bright colors, wish it grew better for me as the foliage is a relief to spot in xeric landscapes. It's ok by me if some don't appreciate these, I love them, and apparently my sense of smell is twisted to other intensities, so NOT an issue.

The smell is awful, but for me the worst part was the FLIES. I had visions of lovely butterflies, but instead we got clouds of black and green flies. Right next to the patio. Every year. Yarrow is a "no" vote for me as well.

Hi GardenRiot, strange to see this old thread revisited. I had forgotten about it and have no yarrow at all in my garden now as it is rather shady and leaning more to pink/blue/ silver. Flies are not a problem in Ireland as the weather is never warm enough.
I guess it just proves that you can't keep everyone happy on any topic. The world would be a much more boring place if we all agreed all the time.
Happy gardening.